Well, this mod is like the original Doom episode 1, Knee deep in the dead, and it's all the fun and thrill the old game was.
It's not the best looking mod for D3 but if you think about original D it still is a huge step foward. The mod itself simply offers the same first episode as the game did, with old weapons, levels, enemies and secrets. The difficulty also is harsh, and this is mod even offers adrnalin rushes of sick oldschool shooting awesomeness on medium difficulty, on hard it's really a nightmare. Only backdraw is that there is only the first episode what means only pistol, shotgun, chaingun, rocketlauncher and a chainsaw, and no plasmarifle or a bfg.
Also the chainsaw is a bit pointless, as it's complettly suicidal to run into any enemy with it.

Over all this one of the best D3 mods I've played so far, as it truely brings back DOOM in all it's classic glory. If you haven't played original DOOM then be sure to play this instead.